US archaeologists have uncovered the tomb in southern Egypt of a previously unknown pharaoh who ruled 3,700 years ago, antiquities officials said on Wednesday.

The discovery by a team from the University of Pennsylvania provides new evidence that at least part of Egypt may have escaped the rule of the Hyksos, invaders from what is now Syria who dominated the Nile Delta between the 18th and 15th centuries BC, the officials said.

A royal cartouche bearing the full name of pharaoh Senebkay was found on the sarcophagus and on a wall of the tomb unearthed in the ancient city of Abydos, the head of the antiquities ministry’s pharaonic department, Ali El-Asfar, said.